Rainbow-electronics MAX9920 Bedienungsanleitung PDF herunterladen

General Description

The MAX9918/MAX9919/MAX9920 are single-supply,

high-accuracy current-sense amplifiers with a high

input common-mode range that extends from -20V to

+75V. These amplifiers are well suited for current moni-

toring of inductive loads such as motors and solenoids,

where common-mode voltages can become negative

due to inductive kickback, reverse-battery conditions,

or transient events.

The MAX9918/MAX9920 feature adjustable gain set by

an external resistive-divider network. The MAX9919 fea-

tures fixed gains of 45V/V (MAX9919F) and 90V/V

(MAX9919N). The MAX9918/MAX9919/MAX9920 oper-

ate as unidirectional amplifiers when V

REFIN

= GND

and as bidirectional amplifiers when V

REFIN

= V

/2.

The MAX9920 attenuates the input signal by a factor of

4 at the input level-shifting stage allowing the device to

sense voltages up to 200mV (unidirectional operation)

or ±100mV (bidirectional operation).

The MAX9918/MAX9919/MAX9920 operate with a sin-

gle 5V supply voltage, are fully specified over the -40°C

to +125°C automotive temperature range, and are

available in an 8-pin SOIC package.

Applications

H-Bridge Motor Current Sensing

Solenoid Current Sensing

Current Monitoring of Inductive Loads

High- and Low-Side Precision Current Sensing

4x4 Transmission Control

Electronic Throttle Control

Super-Capacitor Charge/Discharge Monitoring in

Hybrid Cars

Precision High-Voltage Current Monitoring

Features

♦ -20V to +75V Input Common-Mode Voltage Range

♦ 400µV (max) Input Offset Voltage

♦ 0.6% (max) Gain Accuracy Error

♦ Uni- or Bidirectional Current Sensing

♦ Reference Input for Bidirectional OUT

♦ 120kHz, -3dB Bandwidth (MAX9919N)

♦ Single-Supply Operation (4.5V to 5.5V)

♦ 1mA Supply Current

♦ 0.5µA (typ) Shutdown Current

♦ Rail-to-Rail Output

♦ -40°C to +125°C Automotive Temperature Range

MAX9918/MAX9919/MAX9920

-20V to +75V Input Range, Precision

Uni-/Bidirectional, Current-Sense Amplifiers

________________________________________________________________

Maxim Integrated Products

19-5015; Rev 1; 1/10

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

φ2B

φ1B

ADC

REF

INPUT STAGE

LEVEL SHIFTER

SENSE

BATT

ADJUSTABLE GAIN

RS+

RS-

OUT

REFIN

GND

SHDN

φ2B

φ1A

MAX9918

MAX9920

μC

Typical Operating Circuit

Ordering Information/

Selector Guide

PART

SENSE

(mV)

GAIN

(V/V)

PIN-PACKAGE

MAX9918ASA+ ±50 Adjustable 8 SOIC-EP*

MAX9919FASA+ ±50 45 8 SOIC-EP*

MAX9919NASA+ ±50 90 8 SOIC-EP*

MAX9920ASA+ ±200 Adjustable 8 SOIC-EP*

Note: All devices operate over the -40°C to +125°C tempera-

ture range.

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

1 2 3 4 5 6 ... 17 18

MAX9918/MAX9919/MAX9920 1

Inhaltsverzeichnis

Seite 1 - MAX9918/MAX9919/MAX9920

General DescriptionThe MAX9918/MAX9919/MAX9920 are single-supply,high-accuracy current-sense amplifiers with a highinput common-mode range that extend

Seite 2

MAX9918/MAX9919/MAX9920-20V to +75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers10 ____________________________________________

Seite 3

MAX9918/MAX9919/MAX9920-20V to +75V Input Range, PrecisionUni-/Bidirectional, Current-Sense Amplifiers________________________________________________

Seite 4

MAX9918/MAX9919/MAX9920-20V to +75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers12 ____________________________________________

Seite 5

Detailed DescriptionThe MAX9918/MAX9919/MAX9920 are single-supply,high-accuracy uni-/bidirectional current-sense amplifierswith a high common-mode inp

Seite 6

Uni-/Bidirectional OperationThe MAX9918/MAX9919/MAX9920 support both unidi-rectional and bidirectional operation. The devices oper-ate in unidirection

Seite 7

Shutdown ModeDrive SHDN high to enter low-power shutdown mode.In shutdown mode, the MAX9918/MAX9919/MAX9920draw 0.5μA (typ) of quiescent current.Adjus

Seite 8

MAX9918/MAX9919/MAX9920-20V to +75V Input Range, PrecisionUni-/Bidirectional, Current-Sense Amplifiers16 _____________________________________________

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MAX9918/MAX9919/MAX9920-20V to +75V Input Range, PrecisionUni-/Bidirectional, Current-Sense Amplifiers________________________________________________

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MAX9918/MAX9919/MAX9920-20V to +75V Input Range, PrecisionUni-/Bidirectional, Current-Sense AmplifiersMaxim cannot assume responsibility for use of an

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MAX9918/MAX9919/MAX9920-20V to +75V Input Range, PrecisionUni-/Bidirectional, Current-Sense Amplifiers2 ______________________________________________

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MAX9918/MAX9919/MAX9920-20V to +75V Input Range, PrecisionUni-/Bidirectional, Current-Sense Amplifiers________________________________________________

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MAX9918/MAX9919/MAX9920-20V to +75V Input Range, PrecisionUni-/Bidirectional, Current-Sense Amplifiers4 ______________________________________________

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MAX9918/MAX9919/MAX9920-20V to +75V Input Range, PrecisionUni-/Bidirectional, Current-Sense Amplifiers________________________________________________

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MAX9918/MAX9919/MAX9920-20V to +75V Input Range, PrecisionUni-/Bidirectional, Current-Sense Amplifiers6 ______________________________________________

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MAX9918/MAX9919/MAX9920-20V to +75V Input Range, PrecisionUni-/Bidirectional, Current-Sense Amplifiers________________________________________________

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Seite 18

MAX9918/MAX9919/MAX9920-20V to +75V Input Range, PrecisionUni-/Bidirectional, Current-Sense Amplifiers________________________________________________

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Rainbow-electronics MAX9920 Bedienungsanleitung

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